Document paper



May 23, 1933. I T. J. SNYDER 7 1,910,568

DOCUMENT PAPER Filed April 30, 1932 3nnentor Twan JAY 2236282 am u Patented May 23, 1933 s'rA'rEs PATENT OFFICE THEODORE J. NYDEB, CHICAGO, ILLINOIS DOCUMENT PAPER Application filed April 30,

specified from which written portions cannot be removed or altered by erasure or the use of chemicals or both without changing the visual aspect ol'the document to a degree rendering it readily observable that the document has been fraudulently manipulated. V

in describing my invention reference will be had to the accompanying drawing wherein like characters of reference denote cor responding parts in the several views, and wherein v Figure l. is a perspective view disclosing the structural characteristics of my improved document paper;

Figure 2, a face view of a bank check form or my improved pa er and with written portions thereon; an

Figure 3, a view similar to Figure 2 showing conditions arising both from attempts to erase and to chemically remove written portions of documents embodying my invention.

Referring to the drawing and particularly to Figure 1, my improved document paper is shown as formed of an intermediate layer of aper A and facing layers of paper B and The intermediate layer A is formed of aper having such bibulous texture that contactin therewith will readily difiuse therethroug such texture of the layer A. constituting one of the safety ele- 40 ments of III paper. Each of the facing layers B and are formed of thin tissue paper, the three layers being united to form a single laminated sheet. The exposed faces of the layers B and C in the finished sheet are provided with a fugitive coloring. In this instance I have shown the layer B as red and the layer C as blue.

In Figures 2 and 3 I have shown my improved document paper incorporated in an ordinary bank check with written portions 1932. Serial No. 608,535.

thereon. In applying the written portions the liquid inlr used for that purpose readily passes through the layer B and owing to the bibulous texture of the layer A diffuses through the latter. With the foregoing structure and conditions present, it will be apparent that if attempt is made to alter the check by scratching away a section of the written portion, the thin tissue layer B will be ruptured and a readily observable discolored spot 10 will result owing to the difierence in the coloring of layer A with respect to the layer B. In addition, the ink of the written portion it is attempted to remove has diffusedthrough the layer A and still remains thus presenting a readable outline of that portion of the writing which was removed by scratching away the layer B. Furthermore, the scratching away of the layer B would leave a discernible hole or recess.

If acids or bleaching agents are employed in an efi'ort to alter a written portion of the check shown in Figure 2, the fugitive coloring of layer B will readily respond to such acids or bleaching agents and leave a dis-' colored spot 11 (Figure 3) while the tissue layer B will wrinkle badly or come 0d and the outline of the writing which was removed by chemical action from layer B will still be easily visible in layer A wherein-it is difi'used. Should a continued application of acids or bleaching agents be resorted to for removing the writing outline in layer A, the fibers of the latter will be disturbed and further indicate attempted fraudulent changes and manipulations.

Should attempt be made to alter the check shown in Figures 2 and 3 by operating upon the layer C the same tell tale evidences of fraudulent manipulation heretofore pointed out in connection with layer B will be created.

Any suitable coloring material for the layers B and C may be utilized, so long as it is of a fugitive nature when attacked by acids or bleaching agents. 1

I claim: 1. A document paper comprising a layer of bibulous paper having a layer of tissue 2 2 LQELQMBFES paper on each side face thereof, each of saiol layers of tissue paper being rovided with coloring material which is ugitive when attacked by acidls or bleaching agents.

2. A document paper as in claim 1 Wherein the coloring materials of the tissue paper layers are respectively of difi'erent tones.

In testimony whereof ll hereunto afifix my signature.

THEUDURJE J. SNYDER. 

